Kumamoto City is cited as being one of a few cities to take aggressive steps to monitor for corruption:

—- start quote —- Since assembly secretariats cannot properly inspect the huge volume of documents, some assemblies have installed a system in which a third party, including lawyers and certified public accountants, help with this work.

However, at the present time, only five prefectures — Hokkaido, Tokyo, Osaka, Hyogo, and Fukuoka — and four cities — Saitama, Osaka, Hiroshima, and Kumamoto — utilize such systems. Sakai, Osaka Prefecture, is the only city considering such a system this fiscal year. —- end quote —-

http://the-japan-news.com/news/article/0002061906